Simple instruments facilitating achievement of transanal total mesorectal excision in male patients

Table 4 Postoperative anal functional results of male patients with low rectal cancer n (%)

Items	Pre-operation			1 yr after operation
	Group A	Group B	P value	Group A	Group B	P value
MRP in kPa	12.2 ± 2.2	13.1 ± 3.5	0.126	8.8 ± 2.3	9.0 ± 2.8	0.087
MSP in kPa	18.0 ± 3.6	17.3 ± 3.0	0.054	16.3 ± 3.3	17.6 ± 2.8	0.201
HZL in mm	32.2 ± 5.1	34.7 ± 5.5	0.7	24.9 ± 4.5	24.2 ± 5.9	0.080
Wexner score	0.4 ± 1.2	0.2 ± 0.8	0.112	2.7 ± 2.7	3.6 ± 3.8	0.099
Kirwan classification			0.591			0.617
I	34 (82.9)	64 (86.5)		15 (36.6)	22 (29.7)
II	7 (17.1)	9 (12.2)		16 (39.0)	25 (33.8)
III	0	1 (1.4)		7 (17.1)	19 (25.7)
IV	0	0		3 (7.3)	8 (10.8)
V	0	0		0	0

Wexner scores are presented as number (SD): 0 = perfect continence; 20 = major incontinence. Kirwan classifications are presented as number: Grade I = perfect; Grade II = incontinence of flatus; Grade III = occasional minor soiling; Grade IV = frequent major soiling; Grade V = incontinence. HZL: High-pressure zone length; MRP: Maximum resting pressure; MSP: Maximum squeeze pressure.